#437FB3
Closest named color: Steel Blue (#4682B4). oklch(57.9% 0.102 246.8), rgb(67, 127, 179).
Aa
Black text reads best on this color (4.92:1).
About this color
#437FB3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.102 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.009 away. Black text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.92:1 |
| White text | 4.26:1 |
Values
| HEX | #437FB3 |
| RGB | rgb(67, 127, 179) |
| HSL | hsl(208, 46%, 48%) |
| OKLCH | oklch(57.9% 0.102 246.8) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #437FB3 | 4.26:1 | AA large text | Lc -74.8 | Content text, not long reading |
| Black text on #437FB3 | 4.92:1 | AA | Lc 34.8 | Non-text elements, placeholder text |
| #437FB3 text on white | 4.26:1 | AA large text | Lc 69.3 | Content text, not long reading |
| #437FB3 text on black | 4.92:1 | AA | Lc -32.4 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CCDBE9
oklch(88.4% 0.025 246.2)
-
Step 300
300
#A9C4DD
oklch(80.8% 0.046 246.3)
-
Step 400
400
#7BA5CC
oklch(70.6% 0.073 247)
-
Step 500
500
#588FBF
oklch(63.2% 0.093 246.3)
-
Step 600
600 (this color)
#437FB3
oklch(57.9% 0.102 246.8)
-
Step 700
700
#2E6593
oklch(49.1% 0.094 246.5)
-
Step 800
800
#275278
oklch(42.6% 0.08 247.6)
-
Step 900
900
#254460
oklch(37.6% 0.061 247.4)
-
Step 950
950
#162838
oklch(26.9% 0.038 246.6)
#437FB3 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #6881B5 | 0.042 |
| Deuteranopia (no green cones) | #5976B2 | 0.031 |
| Tritanopia (no blue cones) | #008B91 | 0.079 |
| Achromatopsia (no color) | #7A7A7A | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #437FB3
#437FB3
oklch(57.9% 0.102 246.8)
- #A26D30
#A26D30
oklch(57.9% 0.102 66.9)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #437FB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.009
- Cool Blue #4984B8 ΔE 0.017
- Off Blue #5684AE ΔE 0.027
- Windows Blue #3778BF ΔE 0.033
- Cerulean #457B9D ΔE 0.034
- Dusty Blue #5A86AD ΔE 0.035
- Stormy Blue #507B9C ΔE 0.036
- Nice Blue #107AB0 ΔE 0.036
Use #437FB3 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.